[PATCH net 2/2] selftests: tls: test skb copy under mem pressure and OOB

[Jakub Kicinski <kuba@kernel.org>]

Add a test which triggers mem pressure via OOB writes.

Reviewed-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
 tools/testing/selftests/net/tls.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/tools/testing/selftests/net/tls.c b/tools/testing/selftests/net/tls.c
index cd67b0ae75a7..e788b84551ca 100644
--- a/tools/testing/selftests/net/tls.c
+++ b/tools/testing/selftests/net/tls.c
@@ -2775,6 +2775,22 @@ TEST_F(tls_err, poll_partial_rec_async)
 	}
 }
 
+/* Use OOB+large send to trigger copy mode due to memory pressure.
+ * OOB causes a short read.
+ */
+TEST_F(tls_err, oob_pressure)
+{
+	char buf[1<<16];
+	int i;
+
+	memrnd(buf, sizeof(buf));
+
+	EXPECT_EQ(send(self->fd2, buf, 5, MSG_OOB), 5);
+	EXPECT_EQ(send(self->fd2, buf, sizeof(buf), 0), sizeof(buf));
+	for (i = 0; i < 64; i++)
+		EXPECT_EQ(send(self->fd2, buf, 5, MSG_OOB), 5);
+}
+
 TEST(non_established) {
 	struct tls12_crypto_info_aes_gcm_256 tls12;
 	struct sockaddr_in addr;
-- 
2.51.0